Author: Uri Blass
Date: 14:50:47 05/12/03
Go up one level in this thread
On May 12, 2003 at 16:51:09, Jon Dart wrote: >[D] 7r/4k3/5bRP/5P1P/5K2/8/8/8 w - - > >The move to avoid is Rg7+. It appears that other moves, e.g. Kf3, draw, but Rg7+ >loses. This occurred in a game, so it's not just theoretical. > >Ability to solve this is related to the use of null moves. I think that ability to solve it at depth 1 is dependent first on evaluation. null move is not relevant and with good evaluation or only material evaluation or evaluation without unjustified big bonus for these passed pawns you will never play it. Arasan 5.4 apparently >never switches off Rg7+, but if null move is disabled, it won't play it. > >Arasan 6.3 switches off Rg7+ eventually but it takes quite a while (113 seconds >on a Xeon 1.7GHz). > >Crafty does not ever want to play Rg7+, but in analysis mode, it takes a long >time to see that this is not a good move: Movei does not want to play it. The reason is evaluation without unjustified big bonus for these passed pawns Uri
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